Electric fan



FIG. 1 is a perspective view of an electric fan showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings illustrate parts of the electric fan that form no part of the claimed design. 

CLAIM The ornamental design for an electric fan, as shown and described. 